Brown sulfur dye and process of making same.



- Tb. all whtm'nima concern:

UNITED STATES PATENT OFFICE.

GEORG LIST, OF OFFENBAOH-ON-THE-MAIN, GERMANY, ASSIGNOR TO THE CORPORATION OF GHEMISCHE FABRIK GRIESHEIM-ELEGTRON, 0F rnAnKronr-on-rnE-Miirn,

"BROWN SULFUR YE AND rnocnss on "j.

1 Specification of Letters Patent. l

V Application filedFebruary 24, 1908. Serial No. 417,295. I

Be it known that I, G'EoRGLIsn doctor'of philosophy, chemist, a subject of the German Emperor, and resident of Ofienbachwn-the- Main, Grand'Duchy of Hesse Germany, with the ost-office address .Oberrnainst'rasse N0. 79, ments in .Brown Sulfur Dyes and Processes of Making Same, of which the following is a specification. a 4

I have found that new brown sulfur dyestuffs are obtained by melting together aromatic metadinitro compounds of the general and its products of reduction with glycerin and alkaline polysulfids. process the glycerin acts not as a thinning substance but it participates in the formation of dyestuffs. The dyestuffs thus obtained are different from those obtained by melting the said compounds alone with alkaline polysulfids. By melting dinitrochlorbenzene with alkaline polysulfids f. i. a dyestuff is obtained which dyes cotton olive green shades.

My new dyestuffs dye cotton from a bath containing sodium sulfid bright brown shades of good fastness properties.

The following example illustrates how the roduction of the new coloring matter may e carried out. Parts being by weight.

Example: 500 parts of dinitrochlorbenzene and 230 parts of lycerin are introduced while stirring in a me t prepared from 2000 parts of crystallized sodium sulfid and 500 parts of sulfur. When the reaction has taken place the oil bath is heated up by and by to 200 C. and maintained at this temerature for 4 to 5 hours. The melt is then urther heated in a bake-oven to 235"-240 C. for 4 hours. When cooled down the rough melt is ground. It is a gray brown powder readily'soluble in water and dyeing unmordanted cotton bright brown shades showing a reddish yellow shade when looking over the hand. In analogous manner other dinitro compounds maybe used in the melting process. The relative proportions of sulfur and sodium sulfid and of the starting material may be varied within wide limits without essentially altering the result. The melting The followin ave invented new and useful ImproVe-' In this melting .p Y aY. be Qa ddut th P n of heavy metal salts f.' i. copper sulfate or ch10- rid, of zinc the shades gfetting" deepen-and] se lyt ama :9

t ble will sefvfe toshow 'the brighter, v the fastness propert es remaining tinctorial properties of 'some of the 'd'yestuffs obtainable from aromatic dinitro compounds according to the process hereinbeore described.

Melted together with alkaline polysulfids and glyc- Starting material.

erin dyes cotton- Metadinitrobenzene and products of Brown. reduction thereof.

Metadinitrotoluene and products of Brown.

reduction thereof.

4 :2 1-Dinitrochlorbenzene Brown.

Dinintrophenylamin Blackish brown- Now what I claim and desire to secure by Letters-Patent is the following:

1. The process of manufacturing brown sulfur dyes consisting in melting together aromatic metadinitro compounds of the general formula:

O H X(NO wherein X means IrI,CH ,C l,NH.C H NH.C H .CH ,-S, with glycerin and alkaline polysulfids.

2. As new articles of manufacturev the sulfur dyestuffs obtained by melting together aromatic metadinitro compounds of the general formula with glycerin and alkaline polysulfids, being gray brown powders, dissolving in form of their rough 'melts in water with brown color, from which solutions the dyestufls are precipitated in brown flakes by addition of hydrochloric acid, and dyein unmordanted cotton brown shades from a ath containing sodium sulfid. v

3. The process of manufacturing brown sulfur dyestuffs consisting in melting together dinitrochlorbenzene with glycerin.

and alkaline polysulfids.

4. As new articles of manufacture the sulfur dyestuffs obtained by melting together dinitrochlorbenzene with glycerin and alkaline polysulfids, being gray brown powders,

dissolving in form of their rough ,melts readily in water with brown color, from which solutions the dyestuffs are precipitated in brown flakes on addition of hydrochloric acid, and dyeing unmordanted cotton brown shades from a bath containing sodium sulfid. In testimony, that I claim the foregoing as my invention, I have signed my name in resence of two Witnesses, this tenth day of ebruary 1908.

GEORG LIST.

. WVitnesses:

EVA SATTLER, OSKAR STANDHARDT. 

